The 9 V system ran from 1991 to 2006 and is still a favourite with LEGO train fans. The rails have metal tops that carry the current from a speed regulator to a motor under the locomotive, so trains could run without batteries for as long as they stayed on the track. It started with 4558 Metroliner in 1991.
2003 LEGO Sets
2003 brought challenges but also key innovations that shaped LEGO’s revival. Realistic skin tones were introduced for licensed themes, while yellow remained standard for original ones. Clikits, Designer, and expanded Sports lines reflected diversification efforts, and 4 Juniors replaced Jack Stone for younger builders. World City modernized the classic Town setting. Though financially turbulent, LEGO’s design experimentation and new audience focus paved the way for its recovery.